单项选择题
Thecustomerintendstoinstalla7315-CR2intoap690frame.WhatshouldthepSeriestechnicalspecialisttellthecustomer?()
A.TheHMCisa19"formfactor.
B.TheHMCisa24"formfactor.
C.TheHMCrequiresa100-120voltpowerconnection.
D.TheHMCrequiresa200-240voltpowerconnection.